Pencil sharpener



1,688,840 Oct' 23 1928' H. P. TEvoNlAN PENCIL SHARPENER Filed June 9.1927 uml n Patented oct. 23, 1928.

UNITED STATES PATENT OFFICE.

application med :une 9, 1927. serial No. 197,624.y

This invention relates to a pencil sharpener of the type used bydraftsmen and others to place an extra line point on the lead of apencil.

It is common practice to sharpen the point bv rubbing it over a piece offine sandpaper kept on the desk for this purpose. This is aninconvenient and messy operation and results in graphite dust soilingthe fingers and getting blown about the desk.

The present invention avoids these difiiculties by providing areceptacle that is normally closed in a dust-proof manner and has ahinged side carrying an abrasive on its inner surface. The parts are soarranged that the abrasive surface is readily accessible for sharpeningthe lead when the side is turned down, and upon closing the side thegraphite dust is trapped in the receptacle.

While a preferred form of the invention has been disclosed for purposesof illustration, it should be understood that various changes may bemade in the structure without departing from the spirit and scope of theinvention as hereinafter set forth and claimed.

Fig. 1 is a plan view of the pencil sharpener.

Fig. 2 is a section on line 2 2 of Fig. 1.

Fig. 3 is a view similar to Fig. 2 with the parts in open sharpeningposition.

Fig. 4 is a perspective view of the sharpener in operating position.

Referring to the drawings more specifically, the base 10 is formed atone'end with a handle portion 11 and is apertured at 12 to permithanging the sharpener on a nail if found convenien A box-like receptacleis formed by a rear wall 13 and sloping end walls 14, the front sidebeing without a rigid'wall. The walls 13 and 14 are grooved near theirupper ends as at 15 to receive the removable transparent plate 16, whichis inserted into the grooves from the open side of the receptacle.

A shaft 17 extends through the end walls 14 just above the base 10 andon its end toward handle 11 carries an operating crank 18. A plate 19 isnon-rotatively mounted on shaftV 17 and is of such a si'ze that it completely closes the open side of the receptacle when the parts are in theclosed position of Fig. 2. Any suitable abrasive surface, such as a finesteel file 20, is secured to the inner side of plate 19, and felt pads21 for cleaning the end of the lead after it has been sharpened are alsocarried on the inner side of the hinged plate.

A felt insulator 22 has its lower edge fas` tened to the base 10, andits upper edge pro- ]ects above the top of plate 19 and contacts withthe top plate 16 to maintain a dustproof closure. In order to maintainthe'box in closed position, a spring 23 is arranged with its lower endfastened to the base and its upper end engaging the plate 19 tonorrlrrrally2 bias the hinged side to the position of In order to usethe sharpener the crank 18 is pressed downwardly until the hinged sideis in the position of Fig. 3, in which position the abrasive surface isexposed for use as shown in Fig. 4. After sharpening the lead andcleaning it on one of the pads 21, the pencil is removed and the handlereleased, permitting the spring 23 to close the hinged side and throwthe graphite dust from the file into the closed receptacle. T etransparent top plate 16 permits visual inspection of the sharpeningprocess, and can be slid from the grooves 15 when it is desired to emptythe accumulated dust from the receptacle.

1. A pencil sharpener comprising a re` ceptacle having a top and ahinged side, hinged substantially central of the base and having itsfree edge engagin said top, the inner face of the lnnged side eingprovided with an abrasive surface.

2. A pencil sharpener comprising a receptacle having a top, a hingedside hinged substantially central of the base and havlng its free edgeengaging said top, the inner face of the hinged side being provided withan abrasive surface, and a spring normally biasing the hinged side toclosed position.

3. A pencil sharpener comprising a receptacle having a top, a hingedside, the inner face of the hin ed side being provided with an abrasivesur ace, a spring normally biasing the hinged side to closed position,and an operating handle for opening the hinged side.

4. A pencil sharpener comprising a receptacle having a transparenttopand la hinged vside hinged substantially central. of the base and havingits free ed e engaging said top, the inner face of the inged side beingprovided withranabrasive surface.

5. A pencil sharpener comprising a. re-

ce tacle havin a transparent top, a hinged si e hinged su tantiallycentral of the base and havin its free edge engagin said top, the innerace of the hinged side eing provided with an abrasive surface, and aspring normally biasing the hinged side to closed position. Y

6. A pencil Sharpener comprising a receptacle havin a transparent top, ahinged side, hinged su stantially central of the base and having itsfree edge engagin said top, the inner face of the hinged side eingprovided with an abrasive surface, a spring normally biasing the hingedside to closed position, and an operating handle for opening the hingedside.

7. A pencil Sharpener comprising a receptacle comprising three closedsides, grooves in the sides, a transparent top plate removably fittingin the grooves, a rotatable shaft extending through the receptacle nearits bottom and carrying an operating handle neas-,84o

outside the receptacle, a pivoted side plate non-rotatably secured toshaft, and having its inner face provided with an abrasive surface and aspring normally biasing the pivoted side to closed position.

8. A pencil Sharpener comprising a receptacle comprising three closedsides, grooves in the sides, a transparent top plate removably fittingin the grooves, a rotatable shaft extending through the receptacle nearits bottom and carrying an operating handle outside the receptacle, aivoted side plate non-rotatably secured to t e shaft, the inner face ofthe pivoted side being provided with an abrasive surface and a feltcleaning pad, a felt insulator on the outside of the pivoted side andengaging the top and bottom walls of the receptacle to form a dust-proofclosure, and a spring normally biasing the pivoted side to closedposition.

In testimony whereof I aix m si nature.

HAGOP P. TE O IAN.

